Rheum ×hybridum Murray
Synonym: Rheum rhaponticum
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad P-Forb

Rheum ×hybridum R. W. Smith

R. rhaponticum of Michigan Flora.

Garden rhubarb is an Old World cultigen, ± intermediate between R. rhaponticum L. and R. rhabarbarum L. and presumably of hybrid origin. It is cultivated for its tasty petioles, flavored principally with malic acid. Plants persist long after cultivation and may be spread by dumping of garden refuse and also vegetatively to roadsides, ditch banks, and old fields. First collected in 1890 in Keweenaw Co., it doubtless occurs outside of present cultivation more widely than the map suggests.

The leaf blades, in contrast to the stalks, are poisonous and may even be fatal if eaten.


Benzie County
Cass County
Cheboygan County
Hillsdale County
Houghton County
Keweenaw County
Mackinac County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 24, 2018. http://michiganflora.net/species.aspx?id=2300.